I've got a belkin one. It used to work well with the last car, but have got nice shiny new one now, which is too long to work with. As a temporary fix, i've soldered a long piece of wire onto the areal terminal inside. THis works ok, but there are so many Radio 2 stations in its operating range, I get interuptions every so often.
When they come out, i'll get an Ice>link fibre, assuming theyre not too expensive
